Dark energy doesn't exist, according to a Hungarian-American scientific team.

They instead believe the standard models of the Universe fail to take account of its changing structure, but that once this is done the need for dark energy disappears. Dark energy is thought to make up 68% of the Universe.

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The team published their results in a paper in the Monthly Notices of the Royal Astronomical Society.

The Universe was formed in the Big Bang, 13.8 billion years ago, and has been expanding ever since. The key piece of evidence for this expansion is Hubble's Law, based on observations of galaxies, which states that on average, the speed with which a galaxy moves away from us is proportional to its distance.

Astronomers measure this velocity of recession by looking at lines in the spectrum of a galaxy, which shift more towards red the faster the galaxy is moving away. From the 1920s, mapping the velocities of galaxies led scientists to conclude that the whole Universe is expanding, and that it began life as a vanishingly small point.

In the second half of the 20th century, however, astronomers found evidence for unseen dark matter by observing that something extra was needed to explain the motion of stars within galaxies. Dark matter is now thought to make up 27% of the content of universe. In contrast, ordinary matter amounts to only 5%.

Observations of the explosions of white dwarf stars in binary systems, so-called Type Ia supernovae, in the 1990s then led scientists to the conclusion that a third component, dark energy, made up 68% of the cosmos, and is responsible for driving an acceleration in the expansion of the Universe.

In the new work, researchers led by PhD student Gábor Rácz of Eötvös Loránd University in Hungary question the existence of dark energy and suggest an alternative explanation.

They argue that conventional models of cosmology (the study of the origin and evolution of the universe) rely on approximations that ignore its structure, and where matter is assumed to have a uniform density.

"Einstein's equations of general relativity that describe the expansion of the universe are so complex mathematically that for a hundred years no solutions accounting for the effect of cosmic structures have been found," said Dr. László Dobos, co-author of the paper, also at Eötvös Loránd University.

"We know from very precise supernova observations that the Universe is accelerating, but at the same time we rely on coarse approximations to Einstein's equations which may introduce serious side-effects, such as the need for dark energy, in the models designed to fit the observational data."

In practice, normal and dark matter appear to fill the universe with a foam-like structure in which galaxies are located on the thin walls between bubbles, and are grouped into superclusters. The insides of the bubbles are in contrast almost empty of both kinds of matter.

Using a computer simulation to model the effect of gravity on the distribution of millions of particles of dark matter, the scientists reconstructed the evolution of the Universe, including the early clumping of matter, and the formation of large scale structure.

Taking the structure into account led to a model where different regions of the cosmos expand at different rates. The average expansion rate is consistent with present observations, which suggest an overall acceleration.

"The theory of general relativity is fundamental in understanding the way the universe evolves," said Dr Dobos.

"We do not question its validity. We question the validity of the approximate solutions.

"Our findings rely on a mathematical conjecture which permits the differential expansion of space, consistent with general relativity, and they show how the formation of complex structures of matter affects the expansion. These issues were previously swept under the rug but taking them into account can explain the acceleration without the need for dark energy."

If this finding is upheld, it could have a significant impact on models of the Universe and the direction of research in physics.

For the past 20 years, astronomers and theoretical physicists have speculated on the nature of dark energy, but it remains an unsolved mystery. With the new model, the team expect at the very least to start a lively debate.

Tagsdark energy, Universe, Monthly Notices of the Royal Astronomical Society., Big Bang, Gábor Rácz, Eötvös Loránd University, hungary, Dr. László Dobos